Android旋转动画

Android旋转动画

核心方法

public void startAnimation(Animation animation)

执行动画，参数可以是各种动画的对象，Animation的多态，也可以是组合动画，后面会有。

2个参数的构造方法

/**
* Constructor to use when building a RotateAnimation from code.
* Default pivotX/pivotY point is (0,0).
*
* @param fromDegrees Rotation offset to apply at the start of the animation.
* @param toDegrees Rotation offset to apply at the end of the animation.
*/
public RotateAnimation(float fromDegrees, float toDegrees) {
mFromDegrees = fromDegrees;
mToDegrees = toDegrees;
mPivotX = 0.0f;
mPivotY = 0.0f;
}

第一个参数是图片旋转的起始度数

第二个参数是图片旋转结束的度数

用法

RotateAnimation ta = new RotateAnimation(0, 360);
// 设置动画播放的时间
ta.setDuration(1000);
// 开始播放动画
iv.startAnimation(ta);

效果

以图片左上角为旋转中心，顺时针旋转360度

4个参数的构造方法

/**
* Constructor to use when building a RotateAnimation from code
*
* @param fromDegrees Rotation offset to apply at the start of the animation.
* @param toDegrees Rotation offset to apply at the end of the animation.
* @param pivotX The X coordinate of the point about which the object is being rotated, specified as an absolute number where 0 is the left edge.
* @param pivotY The Y coordinate of the point about which the object is being rotated, specified as an absolute number where 0 is the top edge.
*/
public RotateAnimation(float fromDegrees, float toDegrees, float pivotX, float pivotY) {
mFromDegrees = fromDegrees;
mToDegrees = toDegrees;

mPivotXType = ABSOLUTE;
mPivotYType = ABSOLUTE;
mPivotXValue = pivotX;
mPivotYValue = pivotY;
initializePivotPoint();
}

头两个参数和上面两个参数的构造方法一样，是开始和结束的角度

后两个参数是设置图片的旋转中心

用法

RotateAnimation ta = new RotateAnimation(0, 360, iv.getWidth() / 2, iv.getHeight() / 2);
// 设置动画播放的时间
ta.setDuration(1000);
// 开始播放动画
iv.startAnimation(ta);

效果

以图片中心为旋转中心，顺时针旋转360度

6个参数的构造方法

/**
* Constructor to use when building a RotateAnimation from code
*
* @param fromDegrees Rotation offset to apply at the start of the animation.
* @param toDegrees Rotation offset to apply at the end of the animation.
* @param pivotXType Specifies how pivotXValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT.
* @param pivotXValue The X coordinate of the point about which the object is being rotated, specified as an absolute number where 0 is the left edge. This value can either be an absolute number if pivotXType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
* @param pivotYType Specifies how pivotYValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT.
* @param pivotYValue The Y coordinate of the point about which the object is being rotated, specified as an absolute number where 0 is the top edge. This value can either be an absolute number if pivotYType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
*/
public RotateAnimation(float fromDegrees, float toDegrees, int pivotXType, float pivotXValue, int pivotYType, float pivotYValue) {
mFromDegrees = fromDegrees;
mToDegrees = toDegrees;

mPivotXValue = pivotXValue;
mPivotXType = pivotXType;
mPivotYValue = pivotYValue;
mPivotYType = pivotYType;
initializePivotPoint();
}

比4个参数的构造方法多了第三个和第五个参数，其他用法一样，第三个和四五个参数分别设置第四个和第六个参数的类型，四个参数的构造没有设置，是默认设置了Animation.ABSOLUTE类型

用法

// 创建旋转的动画对象
RotateAnimation ta = new RotateAnimation(0, 360, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
// 设置动画播放的时间
ta.setDuration(1000);
// 开始播放动画
iv.startAnimation(ta);

效果

和上面一样，以图片中心为旋转中心，顺时针旋转360度。

设置动画重复播放的次数的方法

/**
* Sets how many times the animation should be repeated. If the repeat
* count is 0, the animation is never repeated. If the repeat count is
* greater than 0 or {@link #INFINITE}, the repeat mode will be taken
* into account. The repeat count is 0 by default.
*
* @param repeatCount the number of times the animation should be repeated
* @attr ref android.R.styleable#Animation_repeatCount
*/
public void setRepeatCount(int repeatCount) {
if (repeatCount < 0) {
repeatCount = INFINITE;
}
mRepeatCount = repeatCount;
}

使用

sa.setRepeatCount(2);

一直重复

sa.setRepeatCount(Animation.INFINITE);

设置动画重复播放的模式的方法

/**
* Defines what this animation should do when it reaches the end. This
* setting is applied only when the repeat count is either greater than
* 0 or {@link #INFINITE}. Defaults to {@link #RESTART}.
*
* @param repeatMode {@link #RESTART} or {@link #REVERSE}
* @attr ref android.R.styleable#Animation_repeatMode
*/
public void setRepeatMode(int repeatMode) {
mRepeatMode = repeatMode;
}

使用

sa.setRepeatMode(ScaleAnimation.REVERSE);

动画的监听

rotateAnimation.setAnimationListener(new AnimationListener() {

@Override
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub

}

@Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub

}

@Override
public void onAnimationEnd(Animation animation) {
// TODO Auto-generated method stub

}
});